Chair



I M. THUM 1,836,630

CHAIR Filed July 16, 1928 2 Sheets-Sheet 1 o -lNVENTOR M ATTORNEY Dec. 15, 1931.

M. THUM 1,836,630 CHAIR Filed July 16, 1928 2 Sheets-Sheet 2 M ATTORNEY Patented Dec. 15, 1931 1 UNITED STATES MARTIN THUM, OF ROCHESTER, NEW YORK CHAIR Application filed July 16,

The present invention relates to chairs and an object thereof is toprovide a chair which will permit the body of a person seated thereon to swing at the hips to different positions without shifting the positions of the legs between the hip joints and the knees and without shifting the knee joints with reference to the floor or surface on which the chair rests.

To this and other ends, the invention consists of certain parts and combinations of parts all of which will be hereinafter described, the novel features being pointed out in the appended claims.

In the drawings;

Fig. 1 is a side view of a chair constructed in accordance with this invention, parts being in section and the chair being shown with the back slightly tilted to the rear;

Fig. 2 is a bottom view of the seat with parts broken away;

Fig. 3 is a vertical fragmentary section through the chair showing the back thereof in normal position;

Fig. 4 is an enlarged section through the chair seat on the line 44, Fig. 5; and

Fig. 5 is a section on the line 5-5, Fig. 4.

In the illustrated embodiment of the invention, there is provided a lower base portion 1 in which a screw spindle 2 of any suitablev form may turn. This spindle 2 has at its upper end a head 3 which is rigidly secured to i the spindle and which is provided with two forwardly projecting arms 5 bolted or riveted at 6 rigidly to the head 3 and forming a frame or support for a forward seat portion 7 which is secured by screws 8 to said forwardly projecting arms 5.

Pivoted at 9 to the forward supporting frame is a frame 10 which forms a support for a rear seat portion 11, the rear seat portion being secured by screws 12 to the upper face of said frame 10. Depending from the frame 10 is a guide ear 13 which surrounds the guide bolt 14, the inner end of which ex- 1928; Serial No. 293,180.

tends throughan ear 175 on the head 3, and the outer end of which is screw threaded at 16 and has a nut 17- adjustablethereon. A helical spring 18 surrounds this guide bolt and one end abuts a washer 19 while the other end abuts a washer 20. The washer 19 abuts the ear 13 whereas the washer 20 abuts the nut .17. It is to be seen that this spring 18 normally holds the rear seat portion 10 in a horizontal plane with the front seat portion 7 but permits the rear seat portion 10 to swing downwardly about'the pivots 9 as an axis. The rear seat portion 10 may have a back 21 projecting upwardly to the rear edge thereof while arms 22 may connect this back with the forward portion of the rear seat portion 11.

A chair constructed in accordance with this invention permits the user to swing rearwardly about the hips as a pivot without shifting the leg portions between the hips and the knee joint. As the front seat portion 7 has a substantially fixed position with reference to the-flooring upon which the chair rests, the knee joints do not shift and the feet may be maintained on thefioor notwithstanding the. position on the back of the chair. This chair automatically adapts itself to the position of the back of the user without any movement ofthe legs, thus permitting the feet to main tain a uniform position on the fioorfor any back adjustment.

What I claim as my invention and desire to secure by Letters Patent is z.

1. A chair embodying aseat for one person formed of two sections, a front section and a rear section, means supporting the front section in "a rigid position, resilient means supporting the rear section in a normal position substantially in'a horizontal planewith the front section so that it will swing downwardly at its rear edge about an axis adjacent the rear edge of the front section, and a back projecting upwardly from the rear part of the rear section.

2. A chair embodying a seat for one person formed on two sections, a front section and a rear section, means supporting the front section in a rigid position, means supporting the rear section so that it will swing downwardly at its rear edge about an axis adjacent the rear edge of the front section, a back projecting upwardly from the rear part of the rear section, and means resiliently resisting the downward movement of the rear section.

3. A chair comprising a base, a screw spindle adjustable on the base, a frame secured to the upper end of the screw spindle, a forward seat portion held against movement on said frame, a rear seat portion pivotally connected to said frame, a resilient means opposing the movement of the rear seat portion.

4c. A chair comprising a base, a screw spindle adjustable on the base, a frame mounted at the upper end of said screw spindle, a forward seat portion held against movement on said frame, a rear seat portion pivotally connected with the frame, a guide bolt projecting from said frame, an ear on the rear seat portion movable on said guide bolt, and a spring surrounding said guide bolt and opposing the movement of' the pivotally mounted rear seat portion.

5. A chair embodying a base, a single seat supported by said base and having a forward rigid section and a swinging rear section, and means situated at the adjacent edges of the two sections to hold them in seat forming position and permitting a limited downwardly swinging movement of the rear seat section under pressure.

6. In a chair, the combination with a seat having two sections, one in front of the other, both sections being normally in the same plane, of a supporting means having a rigid extension, one of said seat sections being rigidly mounted on said extension and the other section being pivotally connected to said extension permitting said latter section to move downwardly from normal position when under pressure.

7. A chair comprising a base, a seat formed of two sections one in back of the other, means supporting the front section against downward movement on the base, means supporting the back seat member to swing downwardly at its rear edge relatively to front seatmember, a back projecting upwardly from the rear portion of the back seat section, and resilient means resisting the downward movement of the back seat section.

8. A chair comprising a base, a single, seat formed of two sections, one in front of the other, a back projecting upwardly from the rear section, means rigidly supporting the front section on the base, means pivotally supporting the rear section on the base to swing downwardly from a normal'position, and. resilient means opposing the downward and permit it to swing downwardly from a normal position about a horizontal axis adjacent the rear edge of the front section, and a back projecting upwardly from the rear portion of the rear section.

MARTIN THUM. 

